It’s time for another edition of the Marlins mailbag! Any and all questions can be sent via Twitter (@DuseReport).

In this edition, we discuss free agency, potential September call-ups and impact prospects for 2020.

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@BirdmanEnFuego: With the salary coming off the books at the end of the season, do you see them going after a closer? Do you think they will be active in free agency in general?

DUSE: The Marlins will have $27 million freed up as Martin Prado ($15 million) and Starlin Castro ($12 million) hit free agency. Miami’s bullpen took some hits at the trade deadline, shipping Sergio Romo, Nick Anderson and Trevor Richards, so the team will likely need to address that in the offseason.

Since the deadline, the bullpen has posted the worst pitching WAR (-1.8) and the second-worst ERA (7.43) in 63 innings. 21 teams have thrown more bullpen innings during that stretch, so it’s not solely based on high usage. For the season, Miami has the lowest pitching WAR and the sixth-worst ERA (5.18 ERA).

The Marlins definitely need reinforcements, but with the year-to-year volatility among relievers, it’s probably not the best long-term strategy to overpay on a closer — especially when the team is at least another year or two away from contention. Having said that, the Marlins do need to bring in someone who can solidify the back-end of the bullpen, like Romo did this year on a one-year/$2.5 million contract.

And Romo may be the answer once again next year. The veteran reliever enjoyed his time in Miami and seemed open to a potential reunion after being traded. A fan favorite and strong clubhouse presence, he could make sense on a one-year contract.

As for the second part of the question, I think they have to add another bat in free agency to help bolster the offense. Miami would have to finish this season 19-18 just to surpass last year’s 63-98 record, and that seems highly unlikely. The Marlins have done a great job improving the farm system, but in Year Three, they need to show more improvement on the major-league level if they want to start attracting more fans and getting South Florida to buy in.

@RealEly: Give us an under-the-radar September call-up candidate, somebody not currently on the 40-man roster who you could see getting added to the roster and playing for the Marlins next month?

DUSE: Removing 40-man candidates eliminates Monte Harrison, Jesus Sanchez, Magneuris Sierra, Jorge Guzman, Kyle Keller and Robert Dugger as potential options. There are some retread players they could bring up like Peter O’Brien, Rosell Herrera and Isaac Galloway, who currently aren’t on the 40-man roster.

Triple-A shortstop Eddy Alvarez could be a possibility. A Miami native, he’s having a good season, hitting .308/.391/.562 (128 wRC+). At 29, it would be a nice story for him to get his first MLB call-up. However, if Miguel Rojas and JT Riddle are back, there likely won’t be many playing opportunities, especially with a suddenly crowded infield that features Jon Berti, Starlin Castro, Neil Walker, Martin Prado and Isan Diaz.

Off the radar, left-hander Dylan Lee could be an option if the team needs bullpen help down the stretch. The 25-year-old reliever was great in Double-A, posting a 1.91 ERA, but has struggled during his time in Triple-A (5.65 ERA in 14 1/3 innings). His strikeout-to-walk ratio, however, is slightly better with New Orleans (2.83-1). Lee played in Marlins spring training and is Rule 5 eligible this offseason, so maybe the team decides to see what he can do on the big-league level.

@BBlum33: What prospects do you see being the biggest contributors to the team next season?

DUSE: Monte Harrison and Jesus Sanchez both seem like pretty sure bets to receive plenty of outfield time next season. Top 100 prospects, Harrison and Sanchez both bring power to a lineup that desperately needs a boost. If they continue their development, they should find their way into the lineup in the first half of next season.

On the pitching side, flame-throwing right-hander Jorge Guzman could find his way on to the big-league roster. Currently in Double-A, the 23-year-old pitcher has posted a 3.50 ERA in 24 appearances (23 starts). While the franchise is giving him the opportunity to be a starter, he could be a valuable bullpen asset with a fastball in the triple digits if Miami goes that route.

Kyle Keller, who’s also on the 40-man roster, should have a strong shot to crack the bullpen next season. The 26-year-old right-hander had a brief debut, making one appearance, but will likely see extended time in September.